Dark Mode, flat TC UI: missing seperate tree and rest of TC window separator problem

[DrShark]

When Total Commander uses flat UI in dark mode (which is default) and the separator between separate tree and file panel is moved in a way that makes separate tree's horizontal scrollbar to diasppear, the tree's bottom part doesn't have any visible separator with rest of TC window: no line there, and background colors of tree and TC's window are the same.

I see following possible soultions:
1) use white outline in the place of missing horizontal scrollbar;
2) use different dark colors for separate tree background and rest of TC window;
3) always show separate tree's horizontal scrollbar (don't make it disappear ever) when in dark flat ui.

Christian Ghisler doesn't like above solutions. Would be nice to hear better ideas...

[petermad]

Just want to mention that this is only a problem with one separate tree, not when using two.